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Finding the Fourth Proportional to 12,381.60, 17,079.12 and 8,191.20

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Solution

The fourth proportional to 12,381.60, 17,079.12 and 8,191.20 is: 11,298.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,381.60 : 17,079.12 = 8,191.20 : x
  2. Step 2: Convert to fraction form
    12,381.60/17,079.12 = 8,191.20/x
  3. Step 3: Cross multiply
    12,381.60x = 17,079.12 × 8,191.20
  4. Step 4: Simplify right side
    12,381.60x = 139,898,487.74
  5. Step 5: Solve for x
    x = 139,898,487.74/12,381.60
  6. Step 6: Final answer
    x = 11,298.90

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Half scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.